CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 1,923,591	$ 454,930
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Amortization of premiums and discounts of investments, net	289,693	450,031
Amortization of securitized debt premiums and discounts and deferred financing costs	(202)	789
Depreciation, amortization and other noncash expenses	12,907	14,846
Net (gains) losses on disposals of investments	52,649	281
Net (gains) losses on investments and derivatives	(1,207,835)	2,564
Income from unconsolidated joint ventures	5,067	1,651
Payments on purchases of loans held for sale	(110,350)	(69,093)
Proceeds of sales and repayments of loans held for sale	46,721	176,921
Net payments on derivatives	1,286,408	(797,580)
Net change in:
Other assets	(98,456)	(65,053)
Accrued interest and dividends receivable	759	8,475
Accrued interest payable	225,371	22,707
Accounts payable and other liabilities	(136,273)	(88,818)
Net cash provided by (used in) operating activities	2,290,050	112,651
Cash flows from investing activities:
Payments on purchases of Residential Investment Securities	(7,309,307)	(7,682,326)
Proceeds from sales of Residential Investment Securities	3,365,971	4,629,227
Principal payments on Residential Investment Securities	5,664,811	5,846,683
Purchase of MSRs	(381)	(10,000)
Payments on purchases of corporate debt	(464,496)	(252,452)
Principal payments on corporate debt	226,723	254,318
Originations and purchases of commercial real estate related assets	(358,179)	(169,001)
Proceeds from sales on commercial real estate related assets	28,079	11,960
Principal repayments on commercial real estate related assets	395,325	589,499
Proceeds from reverse repurchase agreements	41,248,786	38,955,000
Payments on reverse repurchase agreements	(41,508,548)	(38,955,000)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	4,133	4,227
Payments on purchases of residential mortgage loans held for investment	(373,051)	(512,146)
Proceeds from repayments from residential mortgage loans held for investment	153,722	85,643
Payments on purchases of equity securities	0	(2,104)
Net cash provided by (used in) investing activities	1,073,588	2,793,528
Cash flows from financing activities:
Proceeds from repurchase agreements and other secured financing	2,727,664,289	1,613,527,631
Principal payments on repurchase agreements and other secured financing	(2,729,676,977)	(1,616,345,278)
Proceeds from issuance of securitized debt	279,203	0
Principal repayments on securitized debt	(488,335)	(255,927)
Payment of deferred financing cost	0	(1,079)
Net proceeds from stock offerings, direct purchases and dividend reinvestments	461,044	1,270
Redemption of preferred stock	(412,500)	0
Principal payments on participation sold	0	(12,827)
Principal payments on mortgages payable	0	(36)
Net contributions/(distributions) from/(to) noncontrolling interests	(706)	(676)
Dividends paid	(760,916)	(658,311)
Net cash provided by (used in) financing activities	(2,934,898)	(3,745,233)
Net (decrease) increase in cash and cash equivalents	428,740	(839,054)
Cash and cash equivalents including cash pledged as collateral, beginning of period	706,589	1,539,746
Cash and cash equivalents including cash pledged as collateral, end of period	1,135,329	700,692
Supplemental disclosure of cash flow information:
Interest received	1,879,931	1,582,650
Dividends received	3,355	2,511
Interest paid (excluding interest paid on interest rate swaps)	740,186	454,110
Net interest paid (received) on interest rate swaps	(141,772)	195,973
Taxes paid	136	1,336
Noncash investing activities:
Receivable for investments sold	21,728	9,784
Payable for investments purchased	1,108,834	1,043,379
Net change in unrealized gains (losses) on available-for-sale securities, net of reclassification adjustment	(2,308,427)	235,126
Noncash financing activities:
Dividends declared, not yet paid	$ 349,300	$ 305,709